<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        iframe{width:300px;height:300px;}
    </style>
</head>
<body>
    <iframe src="https://www.baidu.com"></iframe>
    <iframe src="https://www.qq.com"></iframe>
    <iframe src="https://www.126.com"></iframe>
    <iframe src="https://www.taobao.com"></iframe>
    <iframe src="https://www.jd.com"></iframe>
</body>
<script>

    // console.log(screen);
    // console.log(window.screen);
    // console.log(window.screen === screen);


    // ========


    // console.log(frames)
    // console.log(window.frames)
    // console.log(window === frames)
    // console.log(window.frames === frames)
    
</script>
</html>